scripts: sphinx-pre-install: properly handle SPHINXBUILD
Currently, the script ignores SPHINXBUILD, making it useless.
As we're about to use on another script, fix support for it.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/b0217df871a5e563646d386327bdd7a393c58ac2.1750571906.git.mchehab+huawei@kernel.org
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